Influence of manganese content on the supercapacitive performance of PbO$_{2}$-MnO$_{2}$ electrodes

Authors : Yingwu Yao, Mengyao Li, Xinghua Zhang, Zunming Lu, Feng Wei

Pages : 472-481

View : 10 | Download : 8

Publication Date : 9999-12-31

Article Type : Makaleler

Abstract :PbO$_{2}$-MnO$_{2}$ electrodes were prepared by electrochemical codeposition methods. The electrodes were characterized by scanning electron microscope, X-ray photoelectron spectroscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction. The content of manganese in the electrodes increased with the increase in manganese ion concentration in the solution, which can reach 48.4%. The codeposition of manganese decreased the grain sizes and formed the porous structure. Cyclic voltammetry and galvanostatic charge-discharge measurements were used to evaluate the influence of manganese content in the electrodes on the specific capacitive performance of PbO$_{2}$-MnO$_{2}$ electrodes. The specific capacitance of PbO$_{2}$-MnO$_{2}$ (48.4%) electrodes could reach 374.5 F g$^{-1}$. The excellent specific capacitance can be ascribed to the porous structure and the synergy of excellent conductivity of lead dioxide and the good specific capacitance of manganese dioxide.
Keywords : PbO$_{2}$-MnO$_{2}$ electrodes, manganese content, porous structure, supercapacitive property